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Simplifying X + (2 + x) = 21 Remove parenthesis around (2 + x) X + 2 + x = 21 Reorder the terms: 2 + X + x = 21 Solving 2 + X + x = 21 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + X + -2 + x = 21 + -2 Reorder the terms: 2 + -2 + X + x = 21 + -2 Combine like terms: 2 + -2 = 0 0 + X + x = 21 + -2 X + x = 21 + -2 Combine like terms: 21 + -2 = 19 X + x = 19 Add '-1x' to each side of the equation. X + x + -1x = 19 + -1x Combine like terms: x + -1x = 0 X + 0 = 19 + -1x X = 19 + -1x Simplifying X = 19 + -1x
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